chore: add release-please and PR title validation CI

.github/workflows/pr-title.yml

@@ -0,0 +1,17 @@
+name: PR Title
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+jobs:
+  validate:
+    permissions:
+      pull-requests: read
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@e32d7e603df1aa1ba07e981f2a23455dee596825 # v5
+        env:
+          # Required: token isn't auto-injected into env, must be passed explicitly
+          # https://docs.github.com/en/actions/security-guides/automatic-token-authentication
+          GITHUB_TOKEN: ${{ github.token }}

.github/workflows/release-please.yml

@@ -0,0 +1,19 @@
+name: Release Please
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json

.release-please-manifest.json

@@ -0,0 +1 @@
+{".":"0.2.0"}

release-please-config.json

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+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "packages": {
+    ".": {
+      "release-type": "simple",
+      "bump-minor-pre-major": false,
+      "bump-patch-for-minor-pre-major": true,
+      "extra-files": [
+        {
+          "type": "json",
+          "path": ".claude-plugin/plugin.json",
+          "jsonpath": "$.version"
+        },
+        {
+          "type": "json",
+          "path": ".claude-plugin/marketplace.json",
+          "jsonpath": "$.plugins[0].version"
+        }
+      ],
+      "changelog-sections": [
+        { "type": "feat", "section": "Features" },
+        { "type": "fix", "section": "Bug Fixes" },
+        { "type": "chore", "section": "Miscellaneous" },
+        { "type": "docs", "section": "Documentation" },
+        { "type": "refactor", "section": "Code Refactoring" }
+      ]
+    }
+  }
+}